Question

我遇到语法错误 “令牌“ {”的语法错误，{预期在此令牌之后” 和在客户类中使用super（）关键字后，出现“语法错误，插入“}”以完成阻止”。我在其他论坛帖子中四处浏览，但是在我的Customer类中我已经把super（）作为第一件事。我该如何解决？

import java.util.*;

public class Main 
{
public class Customer 
{
   public String Name = "";
   public int ID = 0000;
   public int plansLeft = 0;


   public Customer()
    {
    }

   public Customer (String n, int id, int pl) 
   {
      Name = n;
      ID = id;
      plansLeft = pl;
   }
   public void setName(String n)
   {
      Name = n;  
   }
   public void setidnumber(int id)
   {
       ID = id;
   } 
   public void setdepartmen(int pl)
   {
       plansLeft = pl;
   }


   public String getName()
   {
      return Name;
   }
   public int getIDNumber()
   {
      return ID;
   }
   public int getPlansLeft()
   {
      return plansLeft;
   }
}


public class Session extends Customer 
{
    super(Name, ID, plansLeft);    // <------------------------- issue is here

    public int sessionIDNumber = 0000;
    public int spotsLeft = 0;

    public Session()
    {
    }

    public Session (int cID, int sl) 
       {
        sessionIDNumber = cID;
        spotsLeft = sl;
       }

    public int getsessionIDNumber() {
        return sessionIDNumber;
    }

    public int getspotsLeft() {
        return spotsLeft;
    }

    public void setsessionIDNumber(int sessionIDNumber) {
        this.sessionIDNumber = sessionIDNumber;
    }

    public void setspotsLeft(int sl) {
        this.spotsLeft = sl;
    }
}




public static void main(String[] args) 
{
    Session session = new Session(0117, 1);
    Customer customer = new Customer("Sarah", 12345678, 12);

    System.out.println("Customer Name: " + customer.getName() + "\nCustomer ID: " + customer.getIDNumber() + "\nLessons Remaining: " + customer.getPlansLeft());
    System.out.println("\nSession ID: " + session.getsessionIDNumber() + "\nOpen Spots Available: " + session.getspotsLeft());
}
}

Answer 1

您必须将一些值传递给超类构造函数。并且应该在构造函数之后的第一行调用super

它应该看起来像这样

public Session (int cID, int sl, String Name, int id, int plansLeft) 
   {
    super(Name, id, plansLeft);
    sessionIDNumber = cID;
    spotsLeft = sl;
   }

主要

public static void main(String[] args) 
{

Customer customer = new Customer(0117, 1, "Sarah", 12345678, 12);

System.out.println("Customer Name: " + customer.getName() + "\nCustomer ID: " + customer.getIDNumber() + "\nLessons Remaining: " + customer.getPlansLeft());
System.out.println("\nSession ID: " + customer.getsessionIDNumber() + "\nOpen Spots Available: " + customer.getspotsLeft());
}
}

Answer 2

您要

public Session() { 
  super(Name, ID, plansLeft);
}

super（）作为对父构造函数的调用必须是子构造函数的第一行。

使用super（）的问题

2 个答案: